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                        vue和vuex的区别
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                        js的继承方式
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                        一次完整的HTTP事务
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                        var和let声明变量的区别
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                        浏览器兼容问题
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                        JS 事件绑定、事件监听、事件委托
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                            <b>7.12.</b>
                        
                        数据类型
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                        jq封装Ajax
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                        设置元素垂直居中或文字居中的方式
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                        面试题库
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                        <h3 id="&#x4E00;&#x6B21;&#x5B8C;&#x6574;&#x7684;http&#x4E8B;&#x52A1;&#x662F;&#x600E;&#x6837;&#x4E00;&#x4E2A;&#x8FC7;&#x7A0B;&#xFF1F;">&#x4E00;&#x6B21;&#x5B8C;&#x6574;&#x7684;HTTP&#x4E8B;&#x52A1;&#x662F;&#x600E;&#x6837;&#x4E00;&#x4E2A;&#x8FC7;&#x7A0B;&#xFF1F;</h3>
<h4 id="&#x4EC0;&#x4E48;&#x53EB;http&#x534F;&#x8BAE;">&#x4EC0;&#x4E48;&#x53EB;Http&#x534F;&#x8BAE;</h4>
<pre><code>http&#x534F;&#x8BAE; &#x5373; &#x8D85;&#x6587;&#x672C;&#x4F20;&#x9001;&#x534F;&#x8BAE;&#x3002;
HTTP&#x662F;Hyper Text Transfer Protocol(&#x8D85;&#x6587;&#x672C;&#x4F20;&#x8F93;&#x534F;&#x8BAE;)&#x7684;&#x7F29;&#x5199;&#x3002;
&#x5B83;&#x7684;&#x53D1;&#x5C55;&#x662F;&#x4E07;&#x7EF4;&#x7F51;&#x534F;&#x4F1A;(World Wide Web Consortium)&#x548C;Internet&#x5DE5;&#x4F5C;&#x5C0F;&#x7EC4;
IETF(Internet Engineering Task Force)&#x5408;&#x4F5C;&#x7684;&#x7ED3;&#x679C;&#xFF0C;(&#x4ED6;&#x4EEC;)&#x6700;&#x7EC8;&#x53D1;&#x5E03;&#x4E86;&#x4E00;&#x7CFB;&#x5217;&#x7684;RFC&#xFF0C;
RFC 1945&#x5B9A;&#x4E49;&#x4E86;HTTP/1.0&#x7248;&#x672C;&#x3002;&#x5176;&#x4E2D;&#x6700;&#x8457;&#x540D;&#x7684;&#x5C31;&#x662F;RFC 2616&#x3002;RFC 2616&#x5B9A;&#x4E49;&#x4E86;&#x4ECA;&#x5929;&#x666E;&#x904D;&#x4F7F;&#x7528;&#x7684;&#x4E00;&#x4E2A;&#x7248;&#x672C;
--HTTP 1.1&#x3002;&#x4E3A;&#x7EAA;&#x5FF5;Tim Berners-Lee&#x63D0;&#x51FA;HTTP&#x540E;&#x5BF9;&#x4E92;&#x8054;&#x7F51;&#x53D1;&#x5C55;&#x7684;&#x8D21;&#x732E;&#xFF0C;&#x4E07;&#x7EF4;&#x7F51;&#x534F;&#x4F1A;&#x4FDD;&#x7559;&#x6709;&#x4ED6;&#x6700;&#x539F;&#x59CB;&#x63D0;&#x4EA4;&#x7684;&#x7248;&#x672C;&#x3002;

HTTP&#x534F;&#x8BAE;(HyperText Transfer Protocol&#xFF0C;&#x8D85;&#x6587;&#x672C;&#x4F20;&#x8F93;&#x534F;&#x8BAE;)
&#x662F;&#x7528;&#x4E8E;&#x4ECE;WWW&#x670D;&#x52A1;&#x5668;&#x4F20;&#x8F93;&#x8D85;&#x6587;&#x672C;&#x5230;&#x672C;&#x5730;&#x6D4F;&#x89C8;&#x5668;&#x7684;&#x4F20;&#x9001;&#x534F;&#x8BAE;&#x3002;&#x5B83;&#x53EF;&#x4EE5;&#x4F7F;&#x6D4F;&#x89C8;&#x5668;&#x66F4;&#x52A0;&#x9AD8;&#x6548;&#xFF0C;
&#x4F7F;&#x7F51;&#x7EDC;&#x4F20;&#x8F93;&#x51CF;&#x5C11;&#x3002;&#x5B83;&#x4E0D;&#x4EC5;&#x4FDD;&#x8BC1;&#x8BA1;&#x7B97;&#x673A;&#x6B63;&#x786E;&#x5FEB;&#x901F;&#x5730;&#x4F20;&#x8F93;&#x8D85;&#x6587;&#x672C;&#x6587;&#x6863;&#xFF0C;&#x8FD8;&#x786E;&#x5B9A;&#x4F20;&#x8F93;&#x6587;&#x6863;&#x4E2D;&#x7684;&#x54EA;&#x4E00;&#x90E8;&#x5206;&#xFF0C;
&#x4EE5;&#x53CA;&#x54EA;&#x90E8;&#x5206;&#x5185;&#x5BB9;&#x9996;&#x5148;&#x663E;&#x793A;(&#x5982;&#x6587;&#x672C;&#x5148;&#x4E8E;&#x56FE;&#x5F62;)&#x7B49;&#x3002;

HTTP&#x662F;&#x4E00;&#x4E2A;&#x5E94;&#x7528;&#x5C42;&#x534F;&#x8BAE;&#xFF0C;&#x7531;&#x8BF7;&#x6C42;&#x548C;&#x54CD;&#x5E94;&#x6784;&#x6210;&#xFF0C;
&#x662F;&#x4E00;&#x4E2A;&#x6807;&#x51C6;&#x7684;&#x5BA2;&#x6237;&#x7AEF;&#x670D;&#x52A1;&#x5668;&#x6A21;&#x578B;&#x3002;HTTP&#x662F;&#x4E00;&#x4E2A;&#x65E0;&#x72B6;&#x6001;&#x7684;&#x534F;&#x8BAE;&#x3002;


1.&#x57DF;&#x540D;&#x89E3;&#x6790;
2.&#x53D1;&#x8D77;TCP&#x7684;3&#x6B21;&#x63E1;&#x624B; 
3.&#x5EFA;&#x7ACB;TCP&#x8FDE;&#x63A5;&#x540E;&#x53D1;&#x8D77;http&#x8BF7;&#x6C42;
4.&#x670D;&#x52A1;&#x5668;&#x54CD;&#x5E94;http&#x8BF7;&#x6C42;&#xFF0C;&#x6D4F;&#x89C8;&#x5668;&#x5F97;&#x5230;html&#x4EE3;&#x7801; 
5.&#x6D4F;&#x89C8;&#x5668;&#x89E3;&#x6790;html&#x4EE3;&#x7801;&#xFF0C;&#x5E76;&#x8BF7;&#x6C42;html&#x4EE3;&#x7801;&#x4E2D;&#x7684;&#x8D44;&#x6E90;&#xFF08;&#x5982;js&#x3001;css&#x3001;&#x56FE;&#x7247;&#x7B49;&#xFF09; 
6.&#x6D4F;&#x89C8;&#x5668;&#x5BF9;&#x9875;&#x9762;&#x8FDB;&#x884C;&#x6E32;&#x67D3;&#x5448;&#x73B0;&#x7ED9;&#x7528;&#x6237;

&#x4E00;&#x6B21;HTTP&#x64CD;&#x4F5C;&#x79F0;&#x4E3A;&#x4E00;&#x4E2A;&#x4E8B;&#x52A1;&#xFF0C;&#x5176;&#x5DE5;&#x4F5C;&#x8FC7;&#x7A0B;&#x53EF;&#x5206;&#x4E3A;&#x56DB;&#x6B65;&#xFF1A; 
1. &#x9996;&#x5148;&#x5BA2;&#x6237;&#x673A;&#x4E0E;&#x670D;&#x52A1;&#x5668;&#x9700;&#x8981;&#x5EFA;&#x7ACB;&#x8FDE;&#x63A5;&#x3002;&#x53EA;&#x8981;&#x5355;&#x51FB;&#x67D0;&#x4E2A;&#x8D85;&#x7EA7;&#x94FE;&#x63A5;&#xFF0C;HTTP&#x7684;&#x5DE5;&#x4F5C;&#x5F00;&#x59CB;&#x3002; 
2. &#x5EFA;&#x7ACB;&#x8FDE;&#x63A5;&#x540E;&#xFF0C;&#x5BA2;&#x6237;&#x673A;&#x53D1;&#x9001;&#x4E00;&#x4E2A;&#x8BF7;&#x6C42;&#x7ED9;&#x670D;&#x52A1;&#x5668;&#xFF0C;&#x8BF7;&#x6C42;&#x65B9;&#x5F0F;&#x7684;&#x683C;&#x5F0F;&#x4E3A;&#xFF1A;&#x7EDF;&#x4E00;&#x8D44;&#x6E90;&#x6807;&#x8BC6;&#x7B26;&#xFF08;URL&#xFF09;&#x3001;
&#x534F;&#x8BAE;&#x7248;&#x672C;&#x53F7;&#xFF0C;&#x540E;&#x8FB9;&#x662F;MIME&#x4FE1;&#x606F;&#x5305;&#x62EC;&#x8BF7;&#x6C42;&#x4FEE;&#x9970;&#x7B26;&#x3001;&#x5BA2;&#x6237;&#x673A;&#x4FE1;&#x606F;&#x548C;&#x53EF;&#x80FD;&#x7684;&#x5185;&#x5BB9;&#x3002; 
3. &#x670D;&#x52A1;&#x5668;&#x63A5;&#x5230;&#x8BF7;&#x6C42;&#x540E;&#xFF0C;&#x7ED9;&#x4E88;&#x76F8;&#x5E94;&#x7684;&#x54CD;&#x5E94;&#x4FE1;&#x606F;&#xFF0C;&#x5176;&#x683C;&#x5F0F;&#x4E3A;&#x4E00;&#x4E2A;&#x72B6;&#x6001;&#x884C;&#xFF0C;&#x5305;&#x62EC;&#x4FE1;&#x606F;&#x7684;&#x534F;&#x8BAE;&#x7248;&#x672C;&#x53F7;&#x3001;
&#x4E00;&#x4E2A;&#x6210;&#x529F;&#x6216;&#x9519;&#x8BEF;&#x7684;&#x4EE3;&#x7801;&#xFF0C;&#x540E;&#x8FB9;&#x662F;MIME&#x4FE1;&#x606F;&#x5305;&#x62EC;&#x670D;&#x52A1;&#x5668;&#x4FE1;&#x606F;&#x3001;&#x5B9E;&#x4F53;&#x4FE1;&#x606F;&#x548C;&#x53EF;&#x80FD;&#x7684;&#x5185;&#x5BB9;&#x3002; 
4. &#x5BA2;&#x6237;&#x7AEF;&#x63A5;&#x6536;&#x670D;&#x52A1;&#x5668;&#x6240;&#x8FD4;&#x56DE;&#x7684;&#x4FE1;&#x606F;&#x901A;&#x8FC7;&#x6D4F;&#x89C8;&#x5668;&#x663E;&#x793A;&#x5728;&#x7528;&#x6237;&#x7684;&#x663E;&#x793A;&#x5C4F;&#x4E0A;&#xFF0C;&#x7136;&#x540E;&#x5BA2;&#x6237;&#x673A;&#x4E0E;&#x670D;&#x52A1;&#x5668;&#x65AD;&#x5F00;&#x8FDE;&#x63A5;
</code></pre>
                    
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